Biodiversity of benthic diatoms and their application to monitoring water quallity of Mae Sa stream, Doi Suthep-Pui national park, Chiang Mai
2002
Pekthong, T.(Chiang Mai University, Chiang Mai (Thailand). Faculty of Science. Department of Biology) | Peerapornpisal, Y.(Chiang Mai University, Chiang Mai (Thailand). Faculty of Science. Department of Biology)
Study of the diversity of benthic diatoms and their application for use as indicator species for monitoring water quality in Mae Sa Stream, Doi Suthep-Pui National Park, Chiang Mai, was carried out from April 1998 to September 1999. Five sample sites ranging upstream to downstream locations were selected. Thirty-three genera comprising 278 species of diatoms were found, 51 species of which have never been recorded in Thailand before. The dominant species were Gomphonema pumilum var. rigidum E. Reichardt et Lange-Bertalot and Nitzschia palea Kutzing. Species of diatoms indicative of clean water and found upstream were Eunotia minor (Kutzing) Grunow and Gomphonema clevei Fricke. Species that indicated polluted water were Nitzschia palea Kutzing and Gomphonema parvulum Kutzing. The water quality of Mae Sa Stream could be classified as oligotrophic-mesotrophic to eutrophic depending on the sample site and season. A computer statistical package designed for ecological studies was employed to develop a Mae Sa Diatom Index. Principal Correspondence Analysis (PCA) and Canonical Correspondence Analysis (CCA), was conducted using The Multivariate Statistical Package Version 3.1 for Windows to determine the indicator and dominant species. Twenty-five species of diatoms were scored and listed in the Mae Sa Diatom Index and could be properly used to indicate the physico-chemical properties of the water. However, more indicator species should be included so that the Mae Sa Diatom Index can be used more efficiently.
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